<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // 1. 见名知意
    // 2. 变量名是单个单词不用管了
    let name = "雪儿";
    // 3. 多个单词的时候，用小驼峰或者下划线
    let student_name = "zhangsan";
    let studentName = "lisi";
    
  </script>
</body>
</html>